Angular2 AfterViewChecked & @ViewChild()

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? ? ? ? Component ? ? ? ? Input from ? Componentselector template `where child` ChildComponent ? Input where string ? ? Component ? ViewChild ? AfterViewChecked from ? ChildComponent from ? Component ? selector ? template ` ? ? button clickToggle view childbutton ? ? childcmp ngIf wherechildcmp` ? directives ChildComponent ParentComponent AfterViewChecked ? ViewChildChildComponent viewChild ChildComponent ? showView ? constructor ? ? ? ? console... ? ? console.. ? ? ngAfterViewChecked ? ? ? ? console. .. ? ? ? ? private getMessagecmp ChildComponent string ? ? cmp cmp. ? ? ? Component from ? ParentComponent from ? Component ? ? ? ? directives ParentComponent ? ? selector ? ? template ` ? ? ? ? ? ? ? ? parentcmpparentcmp ? ? ` AppComponent ? ? ? ? ?（编辑：李大同）

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